| abstract |
[PROBLEMS] To further improve the durability when using an ion exchange membrane used in a redox flow battery and the like, and improve the handleability when using the membrane, thereby reducing labor and improving the yield. SOLUTION: A glass fiber base material is impregnated with a sulfonic acid group-containing polymer having a polar group on an aromatic ring, thereby improving charge / discharge durability and handleability as a polymer electrolyte membrane used in a redox flow battery or the like. Improve. [Selection figure] None |